import React, { Component } from 'react'

import './index.css'

export default class Item extends Component {

    state = {
        mouse: false
    }

    //鼠标移入、移出的回调
    handleMouse = (flag) => {
        return () => {
            this.setState({
                mouse: flag
            })
        }
    }

    //勾选、取消勾选某一个todo的回调
    handleCheck = (id) => {
        return (event) => {
            //console.log(id, event.target.checked)
            this.props.updateTodo(id, event.target.checked);
        }
    }

    //删除一个todo的回调
    handleDelete = (id) => {
        if(window.confirm('确定删除吗？')) {
            this.props.deleteTodo(id);
        }
    }

    render() {
        const {id, name, done} = this.props;
        const {mouse} = this.state;
        return (
            <div>
                <li style={{backgroundColor: mouse ? '#ddd' : 'white'}} onMouseLeave={this.handleMouse(false)} onMouseEnter={this.handleMouse(true)}>
                    <label>
                        <input type="checkbox" checked={done} onChange={this.handleCheck(id)} />
                        <span>{name}</span>
                    </label>
                    <button onClick={()=>this.handleDelete(id)} className="btn btn-danger" style={{display: mouse ? 'block' : 'none'}}>删除</button>
                </li>
            </div>
        )
    }
}
